Thin film fabrication of upconversion lanthanide-doped NaYF4 by a sol-gel method and soft lithographical nanopatterning

Heeyeon Park, Gang Yeol Yoo, Min Seop Kim, Kein Kim, Chiho Lee, Sungnam Park, Woong Kim

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


Lanthanide-doped NaYF4 is one of the most efficient upconversion materials and fabrication of high-quality thin-films of this material would be useful in various applications. However, it has been a great challenge to fabricate thin films and/or nanopatterns of this material. In this work, we demonstrate the successful fabrication of the NaYF4 thin films and nanopatterns via a sol-gel process and soft lithography. Upconversion of 980 nm near-infrared wavelength to various visible wavelengths (yellow, green, blue, etc.) has been realized using dopants and/or multilayered film structures. Nanopatterns enhance the light out-coupling efficiency and thus the upconversion intensity by a factor of ∼ 2–3. The fabrication of high-quality films and patterns is enabled by understanding the dependence of the structural, optical, chemical, and thermal properties of the precursor materials on the temperature. Our results will be an important basis for both scientific and technological advances in wavelength conversion in various areas such as displays, optoelectronics, photonics, and photovoltaics.

Original languageEnglish
Pages (from-to)927-935
Number of pages9
JournalJournal of Alloys and Compounds
Publication statusPublished - 2017

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea ( NRF-2013M3C1A3065042 ).

Publisher Copyright:
© 2017 Elsevier B.V.


  • NaYF
  • Nanopatterns
  • Soft lithography
  • Sol-gel
  • Thin films
  • Upconversion

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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